The organ of the excretory system that is composed of small tubules called nephridia is known as the nephridium. The nephridium plays a crucial role in the excretion process of various organisms, helping to remove waste products from their bodies.

Nephridia are commonly found in invertebrates, such as earthworms and insects, where they function as the primary excretory organs. These tubules are responsible for filtering waste materials from the coelomic fluid and expelling them out of the body.

The structure and function of nephridia may vary across different species, but they generally consist of three main parts: the nephrostome, nephridiopore, and the tubules. The nephrostome acts as a funnel-like structure that collects waste products from the coelomic fluid. It then leads to the tubules, which are responsible for the actual filtration and reabsorption of valuable substances, such as water and nutrients. Finally, the nephridiopore serves as an exit point for the excreted waste materials.

As an essential part of the excretory system, the nephridium helps maintain the osmotic balance and remove harmful metabolic byproducts from the body. This excretory process is vital to prevent the accumulation of toxic substances, which could otherwise lead to severe health issues.

In conclusion, the nephridium, composed of small tubules called nephridia, is an integral organ of the excretory system. Its role in filtering waste materials and maintaining the osmotic balance is crucial for the overall health and well-being of various organisms, particularly invertebrates. Understanding the structure and function of nephridia helps us gain insights into the excretory processes of these organisms and highlights the significance of this organ in their survival.

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